#pragma once
#include "Thread.hpp"
#include "Mutex.hpp"
#include "Log.hpp"
#include <vector>
#include <queue>
#include "Cond.hpp"

namespace ThreadPoolModule
{
    using namespace LogModule;
    using namespace CondModule;
    using namespace MutexModule;
    using namespace ThreadModule;

    static const int gnum = 5;
    template<class T>
    class ThreadPool
    {
    private:
        void WakeUpAllThread()
        {
            LockGuard lockguard(_mutex);
            if(_sleepernum)
                _cond.Broadcast();
            LOG(LogLevel::INFO) << "唤醒所有休眠的线程";
        }

        void WakeUpOne()
        {
            _cond.Signal();
            LOG(LogLevel::INFO) << "唤醒一个休眠的线程";
        }

        ThreadPool(const int num = gnum)
            :_num(num), _isrunning(false), _sleepernum(0)
        {
            for(int i = 0; i < num; i++)
            {
                _threads.emplace_back(
                    [this]()
                    {
                        HandlerTask();
                    }
                );
            }
        }
        ThreadPool(const ThreadPool<T> &) = delete;
        ThreadPool<T> &operator=(const ThreadPool<T> &) = delete;
    public:
        static ThreadPool<T> *GetIntance()
        {
            if(inc == nullptr)
            {
                LockGuard lockguard(_lock);
                if(inc == nullptr)
                {
                    inc = new ThreadPool<T>();
                    inc->Start();
                }
            }

            return inc;
        }

        void Start()
        {
            if(_isrunning)
                return;
            _isrunning = true;
            for(auto &thread : _threads)
            {
                thread.Start();
                LOG(LogLevel::INFO) << "start new thread success: " << thread.Name();
            }
        }


        void Stop()
        {
            if(!_isrunning)
                return;
            _isrunning = false;
            
            WakeUpAllThread();
        }

        void Join()
        {
            for(auto &thread : _threads)
                thread.Join();
        }

        void HandlerTask()
        {
            char name[128];
            pthread_getname_np(pthread_self(), name, sizeof(name));
            while(true)
            {
                T t;
                {
                    LockGuard lockguard(_mutex);
                    while(_taskq.empty() && _isrunning)
                    {
                        ++_sleepernum;
                        _cond.Wait(_mutex);
                        --_sleepernum;
                    }

                    if(!_isrunning && _taskq.empty())
                    {
                        LOG(LogLevel::INFO) << name << "退出了，线程池推出&&任务队列为空";
                        break;
                    }

                    t = _taskq.front();
                    _taskq.pop();
                }
                t();
            }
        }

        bool Enqueue(const T &in)
        {
            if(_isrunning)
            {
                LockGuard lockguard(_mutex);
                _taskq.push(in);
                if(_threads.size() == _sleepernum)
                    WakeUpOne();
                return true;
            }
            return false;
        }

        ~ThreadPool()
        {

        }
    private:
        std::vector<Thread> _threads;
        int _num;
        std::queue<T> _taskq;
        Cond _cond;
        Mutex _mutex;
        bool _isrunning;
        int _sleepernum;

        static ThreadPool<T> *inc;

        static Mutex _lock;
    };
    template<class T>
    ThreadPool<T> *ThreadPool<T>::inc = nullptr;
    template<class T>
    Mutex ThreadPool<T>::_lock;
}